Protective mask



FIG. 1 is an upper prospective view of a protective mask my new design;

FIG. 2 is another upper prospective view thereof;

FIG. 3 is a front elevational view thereof;

FIG. 4 is a rear elevational view thereof;

FIG. 5 is a left side elevational view thereof;

FIG. 6 is a right side elevational view thereof;

FIG. 7 is a top plan view thereof; and,

FIG. 8 is a bottom plan view thereof.

The broken lines in the Figures show portions of the protective mask which form no part of the claimed design. 

CLAIM I claim the ornamental design for the protective mask, as shown and described. 